2001AJ....122.3325K

Query : 2001AJ....122.3325K

2001AJ....122.3325K - Astron. J., 122, 3325-3334 (2001/December-0)

Multiplicity of x-ray-selected T Tauri stars in Chamaeleon.

KOEHLER R.

Abstract (from CDS):

We report on a multiplicity survey of a sample of X-ray-selected young stars in the Chamaeleon association. We used speckle interferometry and direct imaging to find companions in the separation range 0".13-6". After correction for chance alignment with background stars, we find a multiplicity (number of binaries or multiples divided by number of systems) of 14.0%±4.3% and a companion-star frequency (number of companions divided by number of systems) of 14.7%±5.1%. Compared with solar-type main-sequence stars, the companion-star frequency is lower by a factor of 0.61±0.27. This is remarkably different from the high multiplicity found in the Taurus-Auriga star-forming region and for T Tauri stars in Chamaeleon known before ROSAT. We find only a few binaries with projected separations of more than 70 AU, also in contrast to the results for stars known before ROSAT. This indicates that the X-ray-selected stars belong to a different population than the stars known before ROSAT, a hypothesis further supported by their Hipparcos distances and proper motions.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: Visual - Infrared Radiation - Stars: Pre-Main-Sequence - Surveys - Techniques: Interferometric

Nomenclature: Tables 1, 2: [K2001c] NN (Nos 1-82). Table 1: [K2001c] RX J1243.1-7458A (Nos A-C).

Simbad objects: 96

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Number of rows : 96
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1393 1
2 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3435 0
3 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1357 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2331 0
5 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1619 1
6 V* EG Cha Or* 08 36 56.2143359952 -78 56 45.633633000   11.82 10.457   9.010 K4Ve 98 0
7 RX J0842.4-8345 TT* 08 42 22.7684292048 -83 45 24.751973196     12.096   10.424 K7 14 0
8 NAME eta Cha Association OpC 08 42 32.9 -78 57 47           ~ 363 0
9 V* EM Cha Or* 08 43 07.2443828304 -79 04 52.483961064     10.8     K6.0 57 0
10 V* EO Cha Or* 08 44 31.8938144088 -78 46 31.143275076     12.531   10.646 M0e 74 0
11 V* EQ Cha TT* 08 47 56.7585043512 -78 54 53.185560516   14.777 13.308 12.802 10.795 M3 80 0
12 CD-77 353 TT* 08 49 11.0947949808 -77 35 58.588129464   10.04 8.786   7.503 K1III 14 0
13 CD-75 392 TT* 08 50 05.4486135048 -75 54 38.082436848   11.305 10.604 10.493 9.728 G9V 39 0
14 CPD-82 291 TT* 08 53 05.3105538408 -82 43 59.791519848   12.52 11.50     K4 13 0
15 RX J0901.0-7715 TT* 09 00 59.5 -77 15 16           G5 3 0
16 RX J0902.9-7759 TT* 09 02 51.2713949520 -77 59 34.668343068   15.457 13.980 13.617   M3e 20 0
17 RX J0915.4-7608 Ro* 09 15 29.1294168312 -76 08 47.129815104     12.142   10.452 K7 22 0
18 2MASS J09171033-7744019 TT* 09 17 10.3487931504 -77 44 02.142022020   11.34 10.50 10.64   G2 14 0
19 HD 81485B SB* 09 19 23.9788595160 -77 38 45.104008632   10.43 9.56     K0IVe 19 0
20 HD 81485A TT* 09 19 24.6525107640 -77 38 36.351469968   9.02 8.33     G7V 30 0
21 HD 82879 TT* 09 28 21.1218832104 -78 15 35.367616224   9.43 8.99     F6/7IV/V 25 0
22 RX J0933.2-7433 TT* 09 33 09.67 -74 33 10.4     15.42     ~ 6 0
23 RX J0935.0-7804 TT* 09 34 55.8994070808 -78 04 19.246056996     13.87     M3 20 0
24 HD 84075 TT* 09 36 17.8234661352 -78 20 41.588588076   9.18 8.59     G2V 57 0
25 2MASS J09424962-7726407 TT* 09 42 49.6245150312 -77 26 40.827783840     13.48     M1 15 0
26 2MASS J09465051-8011352 TT* 09 46 50.5064868936 -80 11 35.104921764           K8 7 0
27 HD 86356 TT* 09 51 50.6839987728 -79 01 37.826858352   10.93 10.201   9.243 K0Ve 30 0
28 HD 86588 ** 09 53 13.7246814696 -79 33 28.627177500   10.17 9.63     F6V 21 0
29 RX J1001.1-7913 TT* 10 01 08.7349806576 -79 13 07.685018184     13.302   11.284 M0.5 20 0
30 RX J1005.3-7749 TT* 10 05 20.0290939080 -77 48 42.243448788   14.76 13.35 13.12 11.32 M1e 20 0
31 V* DR Oct RS* 10 07 29.5296132223 -85 04 32.990588292   9.42 8.685   7.709 G3V 110 0
32 2MASS J10093502-8105509 TT* 10 09 35.0354015640 -81 05 50.897061420           G8 9 0
33 [K2001c] 27 TT* 10 14 08.07 -76 36 32.8   15.802 14.186     M4 18 0
34 2MASS J10142048-8138423 TT* 10 14 20.4530136840 -81 38 42.272891376           K7 9 0
35 2MASS J10175369-7431172 TT* 10 17 53.6912621520 -74 31 17.367896280     12.50     G8 8 0
36 2MASS J10354856-7858583 TT* 10 35 48.5440497000 -78 58 58.305048204     13.71     K6 10 0
37 HD 92727B TT* 10 39 31.4312023104 -75 37 51.405907116   11.92 10.99     G3 5 0
38 HD 92727A TT* 10 39 31.7269349640 -75 37 56.278132680   10.27 9.68 9.86   G1V 6 0
39 HD 92727 ** 10 39 31.72928 -75 37 56.2785           F7/8(V) 26 0
40 2MASS J10443523-7849244 TT* 10 44 35.2075938024 -78 49 24.470246928     14.52     M3e 8 0
41 2MASS J10485467-7655450 TT* 10 48 54.6881294952 -76 55 45.111560088           K6 9 0
42 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1154 1
43 [AKS95b] RX J1108.8-7519a TT* 11 08 49.73 -75 19 41.6           ~ 9 0
44 2MASS J11085326-7519374 SB* 11 08 53.2624718232 -75 19 37.422907320     12.17     M2 18 1
45 V* PU Car TT* 11 08 53.6905436304 -75 21 36.001367136   15.487 14.275 14.560   M1Ve 33 0
46 [CCE98] 1-74 TT* 11 09 17.6942588064 -76 27 57.926988648   15.48 13.92   11.72 K4Ve 44 0
47 V* XX Cha Or* 11 11 39.6728641032 -76 20 15.032221548   16.67 15.28   12.56 M3Ve 116 1
48 CHX 18 X 11 11 49.8 -76 19 48           ~ 62 1
49 Sz 41 TT* 11 12 24.3973943352 -76 37 06.181395384   11.2 11.60   10.22 K7+M2.5 102 1
50 RX J1117.0-8028 PM* 11 16 57.2996112672 -80 27 52.197887340   16.720 15.011 14.743   M4e 16 0
51 CPD-77 660 TT* 11 20 19.8911036832 -78 28 21.186312744   11.98 10.924 10.567 9.362 K5e 20 0
52 RX J1123.2-7924 TT* 11 22 55.6421746920 -79 24 44.005377168     13.72     M1.5 17 0
53 HD 99827 TT* 11 25 17.7399826296 -84 57 16.359618801   8.08 7.64     F5V 51 0
54 2MASS J11291261-7546263 TT* 11 29 12.6349452648 -75 46 26.416175772     12.91     K3Ve 24 0
55 RX J1140.3-8321 TT* 11 40 16.6137236784 -83 21 00.350133984   12.604 11.464 11.197 10.132 K4Ve 31 0
56 V* DZ Cha TT* 11 49 31.8528592968 -78 51 01.062617652   14.330 12.766 12.511 10.732 M0Ve 73 0
57 RX J1150.4-7704 TT* 11 50 28.2998335776 -77 04 38.269946136     12.0   10.54 K4 23 0
58 RX J1150.9-7411 TT* 11 50 44.9860743984 -74 11 13.549913556   16.10 14.63 14.28 11.84 M3.7 17 0
59 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 806 0
60 V* T Cha Or* 11 57 13.5245085552 -79 21 31.530508884   10.00 11.86     K0e 272 1
61 [FLG2003] eps Cha 20 TT* 11 58 26.8127478312 -77 54 45.267517728   15.85 14.29     M3Ve 19 0
62 V* DW Cha Ro* 11 58 28.1662230312 -77 54 29.563860420   11.63 10.502   9.011 K4Ve 47 1
63 2MASS J11583429-7913175 TT* 11 58 34.2908059968 -79 13 17.681212884     13.02     K3 12 0
64 RX J1159.7-7601 TT* 11 59 42.2711847672 -76 01 26.178271284   12.46 11.11   9.858 K4Ve 63 0
65 HD 104467 TT* 12 01 39.1168325928 -78 59 16.915311240   9.26 8.466   7.678 G3V(e) 56 0
66 RX J1202.1-7853 TT* 12 02 03.7125300480 -78 53 01.320796464     12.450   10.49 M0e 27 0
67 RX J1202.8-7718 TT* 12 02 54.6320153808 -77 18 38.075876532     14.483   12.081 M3.5 22 0
68 2MASS J12033923-8129422 TT* 12 03 39.1709536176 -81 29 42.212654988           K1 12 0
69 RX J1204.6-7731 TT* 12 04 36.1405166328 -77 31 34.731426468     13.873   11.297 M3 31 0
70 RX J1207.7-7953 TT* 12 07 48.2795515656 -79 52 42.373806168     14.455   11.943 ~ 17 0
71 CPD-75 783 TT* 12 07 51.174576 -75 55 16.05828   11.16 10.04 9.90 8.584 K4(e) 21 0
72 RX J1209.8-7344 TT* 12 09 42.8209730184 -73 44 41.444953692   12.31 11.29   10.135 K1e 19 0
73 RX J1216.8-7753 TT* 12 16 45.9354065016 -77 53 33.462798648     13.851   11.568 M3 25 0
74 HD 106772 * 12 17 26.9112030432 -80 35 06.827693568   9.40 8.54     G4III 20 0
75 RX J1219.7-7404 TT* 12 19 43.7030774208 -74 03 57.254127300     13.1   10.95 M1 33 0
76 RX J1220.4-7407 TT* 12 20 21.7911659448 -74 07 39.516658140     12.780   10.52 M1V 38 0
77 CD-74 673 TT* 12 20 34.3777314336 -75 39 28.630039572   11.55 10.588   9.449 K3Ve 33 0
78 HD 107722 TT* 12 23 29.0429848776 -77 40 51.427021368   8.75 8.29     F6V 29 0
79 CD-74 681 TT* 12 24 47.3523446520 -75 03 09.043286292 12.297 11.543 10.560 9.877 9.275 K3Ve 36 0
80 CD-78 502 TT* 12 25 13.4187998472 -78 57 34.670490084   11.36 10.70     G7 21 0
81 RX J1231.9-7848 TT* 12 31 56.0768455752 -78 48 32.520741012     14.051   11.700 M2.5 12 0
82 HD 109138 TT* 12 33 29.7897267528 -75 23 11.250927348   10.24 9.47     K0V 47 0
83 CD-74 712 TT* 12 39 21.2761289184 -75 02 39.186556764   11.15 10.303   9.197 K3Ve 46 0
84 [K2001c] RX J1243.1-7458C * 12 42 52.720 -74 58 48.67           ~ 1 0
85 RX J1243.1-7458 TT* 12 42 53.3342783088 -74 58 47.966310264   16.37 14.81 14.51 12.36 M3e 12 1
86 RX J1243.6-7834 TT* 12 43 36.6269751288 -78 34 07.683118356     13.063   10.716 ~ 10 0
87 NAME Cha II MoC 12 54 -77.2           ~ 337 0
88 Sz 49 Y*O 13 00 53.2473650928 -76 54 15.206649912   15.6       M0.5 43 0
89 2MASS J13030444-7707027 TT* 13 03 04.4591495760 -77 07 02.759053872     13.23     M0 16 1
90 TYC 9413-2147-1 TT* 13 07 22.9175828808 -76 02 36.250602504   11.649 10.428 10.259   K0 15 0
91 RX J1320.0-7406 TT* 13 19 57.2 -74 06 10           G5 3 0
92 2MASS J13254188-7955160 TT* 13 25 41.8746157752 -79 55 16.198786884   12.387 11.509 11.308 10.60 K1 12 0
93 2MASS J13462594-7409295 TT* 13 46 25.9460587032 -74 09 29.585033820           G4 3 0
94 CD-75 652 TT* 13 49 12.9354906672 -75 49 47.448396768   10.22 9.680   8.724 G1V 25 0
95 1RXS J141459.5-782216 TT* 14 14 59.5 -78 22 16     12.31     G5 7 0
96 NAME Lupus Complex SFR 16 03 -38.1           ~ 720 0

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